golang 中的只读变量

示例：

// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package proxy

import (
	"net"
)

type direct struct{}

// Direct is a direct proxy: one that makes network connections directly.
var Direct = direct{}

func (direct) Dial(network, addr string) (net.Conn, error) {
	return net.Dial(network, addr)
}

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

package proxy

import (

"net"

)

type direct struct{}

// Direct is a direct proxy: one that makes network connections directly.

var Direct = direct{}

func (direct) Dial(network, addr string) (net.Conn, error) {

return net.Dial(network, addr)

}

上面是 golang.org/x/net/proxy/direct.go 里面的代码

我们显然是可以在proxy包外访问到Direct变量的
我们显然是无法在proxy包外new 一个 direct 结构变量的
由于2，而且我们无法改变Direct的变量类型，所以，我们做不到给Direct进行重新赋值

golang 中的只读变量

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